Most of us are happy with a simple single-family home. A nice yard, modern kitchen, ensuite bathrooms -- these are all features homeowners seek. But for some, that's not enough.

There are a few homebuyers who stepped outside of the box for their dream home. All over the world, there are unique homes built in different shapes, sizes, and styles. From a mushroom home in Ohio to a seashell-inspired house in Mexico, here are ten homes with bizarre themes.

Photo by Heavybluesman / CC BY-SA

1. Spaceship House - Chatanooga, TN

This unique home was featured on HGTV's "What's With That House?" and for good reason. Located on Signal Mountain in Chattanooga, TN, this Trekkie dream home is famous because of its classic spaceship design. Built in 1973 by Curtis King for his son, this rare home is suspended one story off the ground on six large reinforced cement pillars. Its dome-like shape provides 2,000 square feet of living space with plenty of small square windows encircling the home, offering scenic views of the Tennessee River and Signal Mountain.

2. Boeing 727 House - Benoit, MS

One ambitious aviation enthusiast took her passion to the next level, transforming an out-of-commission Boeing 727 into her full-time home. For an investment of $30,000, Joanne Ussary bought, moved, and renovated a used airplane and turned it into her dream home. She customized it with a personal Jacuzzi in the cockpit, a garage door remote to open the stairs, and put a master bedroom in the first class section of the plane. The plane even has room for a modern kitchen, luxury bathroom, three bedrooms, and a living room. Unfortunately, the plane is no longer, having been damaged when a moving company dropped it in the process of relocating the home a mile down the street. But Joanne's dream home lives on, inspiring others to follow in her footsteps.

Photo by Mahfuz Ahmed / CC BY

3. Nautilus House - Mexico City, MX

Just outside of Mexico City is The Nautilus House, a shell-shaped home that blends an aquatic aesthetic with a modern design. Conceptualized by Mexican architect Javier Senosiain of Arquitectura Organica, the final product was influenced by famous architects like Franklin Lloyd Wright and Antoni Gaudi. Senosiain based the idea around "Bio-Architecture" which centers on the idea that buildings should be designed around organic, natural forms that showcase local history, tradition, and cultural roots for a home that feels natural yet intentional. The Nautilus House features colorful stained glass walls that flow seamlessly throughout the open floor plan and forms a giant shell.

4.Toilet-Shaped Home - Suwon, South Korea

When you think you've heard of everything, just remember that there was someone in the world who wanted to know what it felt like to live in a toilet. Sim Jae-Duck, former mayor of Suwon in South Korea, designed this bizarre toilet-shaped two-story home in honor of the creation of the World Toilet Association in 2007. Aside from reportedly being born in a bathroom, Jae-Duck made it his career goal to advocate for clean and efficient sanitation for people living without toilets around the world. The toilet house is 4,520 square-feet and made of steel, concrete, and glass materials. It features rainwater harvesting technology, a large rooftop balcony accessible via a "toilet drain" staircase, and a glass-walled bathroom that allows users to turn the walls opaque for privacy at the touch of a button. The former mayor passed away in 2009 and since then the house has become -- what else? -- a toilet museum that is free to visit.

Photo by Tomasz Sienicki / CC BY

5. Upside Down House- Szymbark, Poland

If you are traveling to Poland, make a stop at the two-story Upside Down House in Szymbark that's at the foot of the highest mountain in the Kaszubian Province. Built by philanthropist and designer Daniel Czapiewski, this structure was a statement about the Communist ideology, in power in Poland during that time period, and designed to show the public about the "wrong-doings against humanity." It only took builders 114 days to complete the Upside Down House even though they had to take several breaks to ease the dizziness and nausea during construction. Tourists can check out the bizarre home by entering through the roof window and walking around on the ceilings but they should be forewarned that they might get a little seasick.

6. Shoe House - Hellam, PA

"There was an old woman who lived in a shoe," so the classic children's poem goes, but in Hellam, PA it's more than just a story. Colonel Mahlon Nathaniel Haines designed the Shoe House for advertising purposes in 1948. It was said that Haines handed an old work boot to an architect and ordered to have a home built like the boot. The house is 45 feet in length, 17 feet wide, and 25 feet high, yet has enough room for a living room, kitchen, two bathrooms, and three bedrooms. The Shoe House has been turned into a museum in memory of Haines who was regarded as the "Shoe Wizard."

Photo by Kevin Trotman / CC NC-ND

7. Mushroom House - Cincinnati, OH

Architect Terry Brown, a former professor of Architecture and Interior Design at the University of Cincinnati, designed the Mushroom House, also known as the Tree House, between 1992 and 2006 with the help of his students. Far from being a feather in his architectural cap, Brown actually used the Mushroom House as his secondary home. He crafted this home by using different materials like metals, wood, colored glass, ceramics, and shell pieces to create unique and irregular shapes that resemble the haphazard forms found in nature. This home provides a unique visual experience by using a variety of colors, textures, and shapes that are combined with nature, making it extraordinary eye candy despite the fungal theme.

8. Dog Bark Inn - Cottonwood, ID

The Dog Bark Inn is unapologetically canine-centric. This beagle-shaped building is a charming bed and breakfast that's decorated with wood-carved dogs. Created by chainsaw artists Dennis Sullivan and Frances Conklin in 2003, this folksy structure has enough space for four people and comes with a continental breakfast for overnight guests. It is, as you might suspect, pet friendly.

Photo by Brian Donovan / CC BY-SA

9. Fallingwater - Mill Run, PA

This home isn't exactly bizarre but is rather an edgy take on the modern style. This angular home was designed by world-famous architect Frank Lloyd Wright for the Pittsburgh businessman Edgar Kaufman with the assistance of the businessman's son and Wright's brief prodigy, Edgar Kaufman Jr. The home, which was built between 1936 and 1939, is a popular attraction because it appears to float over a 30-foot waterfall. It is considered one of Frank Lloyd Wright's greatest architectural achievements of the 20th century and would subsequently be named a National Historic Landmark and one of Smithsonian's list of places "to visit before you die."

10. Palace of Bubbles- Cannes, France

Located just outside of Cannes, the Palais Bulles (Palace of Bubbles) was designed by architect Antti Lovag in 1989. The Bubble House is famous for its celebrity-centric parties and ignominious events, so it was of course a favorite late-night hangout spot for avant-garde designer Pierre Cardin, who would end up purchasing the property in the early 90s. This unique structure overlooks the Mediterranean Sea and the red cliffs of the l'Esterel and offers panoramic views of the Bay of Cannes. Spanning more than 12,000 square feet, the Palace of Bubbles has gardens, pools, a lounge, amphitheater, and reception room, making it the perfect party house. The house consists of 28 rooms shaped like soap bubbles with floor-to-ceiling carpeting. It should be noted that Pierre Cordin, who put the home on the market in 2015, became famous for designing the bubble dress while employed by Christian Dior in the 40s.